BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, JUNE 20, 2017   ALL TIMES ARE IN EASTERN STANDARD TIME HEAVY MORNING RAIN, HUMIDITY DECREASES FIRST RIPE BLUEBERRY OF THE YEAR Light rain last evening and heavy rain early this morning totaled 0.30 inches at 7:00AM EST.  With the passing of the cold front, dew points began to fall, and visibility began to improve.  Dew points fell from the upper 60s to the much more comfortable low 60s by 1:00PM.  Visibility reached 70 miles in most directions by early afternoon. The first ripe blueberry of the season was observed today. It occurs very close to the long-term average date of June 21 and 13 days later than last year's first ripe blueberry. Today's Observations: 7 A.M. Weather: Broken stratus fractus, overcast altostratus, patches of fog drifting below summit Temperature: 68F; Dew Point: 67F; Wind: SSW at 10 kts Sea-level pressure: 29.87 ins. Hg, rising, then more slowly Visibility: 20 miles, distant fog in all directions 6-hr Max temp: 68F 6-hr Min temp: 67F 24-hr precip: 0.30 in. BHO SA 1155 E12 BKN 110 OVC 20 114/68/67/2010/987/ PTCHS FG DRFTNG BLO SMT DSNT FG ALQDS/ 8/72/ 51007 MANUAL 70030 ASOS 70031 10068 20067 10 A.M. Weather: Scattered cumulus, scattered cirrostratus Temperature: 76F; Dew Point: 67F; Wind: SSW at 11G19 kts Sea-level pressure: 29.86 ins. Hg, rising then falling Visibility: 40 miles, distant haze BHO SA 1455 19 SCT 200 SCT 40 112/76/67/2111G19/986/ DSNT HZ ALQDS/  8/105 58002  1 P.M.  Weather: Scattered cumulus, scattered cirrostratus  Temperature: 80F; Dew Point: 60F; Wind: SW at 11G19 kts Sea-level pressure: 29.84 ins. Hg, falling unsteadily Visibility: 70 miles 6-hr Max temp: 82F 6-hr Min temp: 68F BHO SA 1755 49 SCT 250 SCT 70 105/80/60/2213G21/984/ VSBY NE-S 50/ 8/105 58007 10082 20068 SUMMARY FOR MONDAY, JUNE 19, 2017   TEMPERATURE (DEGREES F) MAX.....82   NORMAL.....76 MIN.....67   NORMAL.....58 MEAN....75   NORMAL.....67 DEPARTURE FROM 30-YEAR NORMAL.........................+8 TOTAL DEPARTURE FOR THE MONTH........................+21 [+0.9 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............0   DEPARTURE..........-2 TOTAL HEATING UNITS FOR THE MONTH..............62   DEPARTURE...........0 TOTAL HEATING UNITS FOR THE SEASON...........5724   DEPARTURE........-641 TOTAL HEATING UNITS LAST SEASON TO DATE......5282   DIFFERENCE.......+442 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY..............10   DEPARTURE..........+6 TOTAL COOLING UNITS FOR THE MONTH..............74   DEPARTURE.........+23 TOTAL COOLING UNITS FOR THE SEASON............130   DEPARTURE.........+55 TOTAL COOLING UNITS LAST SEASON TO DATE........86   DEPARTURE.........+44 PEAK GUST AND AVERAGE WIND SPEED (MPH)  PEAK WIND GUST FOR YESTERDAY...................40  S  AT 1:37 P.M.                    AERO........................43  S  AT 1:49 P.M.                    ASOS........................42  S  AT 1:37 P.M.                    DAVIS.......................42 SSW AT 2:24 P.M. RMY 43 FASTEST MILE FOR YESTERDAY.....................30  S  AT 1:32 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................30  S  AT 1:38 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................28 SSW AT 2:25 P.M. AVERAGE WIND SPEED AND DIRECTION.............18.2  S                    ASOS......................17.3                    DAVIS.....................15.4 SSW [195 DEG.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.30  DEPARTURE......+0.15                          ASOS..............0.31 TOTAL PRECIPITATION FOR THE MONTH..........5.62  DEPARTURE......+2.61                          ASOS..............5.69 TOTAL PRECIPITATION FOR THE YEAR..........30.96  DEPARTURE......+5.29                          ASOS...............N/A *** *** ASOS annual total not available due to erroneous readings PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST AERO: Aerovane wind recording system gust RMY:  R.M. Young wind gust recording system TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized M:    Missing data 6/1  78/55/67/+5/0.06/706/78               39 NW  AERO 39 NW  RMY 41 6/2  70/50/60/-2/T/652/72                  32 WNW AERO 35 WNW RMY 34 6/3  66/47/57/-5/0.01/472/52               23 NW  AERO 25 NW  RMY 24 6/4  71/49/60/-3/0.28/490/54               21 SSE*AERO 21 SW  RMY N/A 6/5  55/49/52/-11/1.20/000/00              32 NE  AERO 35 NE  RMY N/A 6/6  49/45/47/-16/1.36/000/00              40 ENE AERO 43 ENE RMY 43 6/7  65/47/56/-8/0.05/519/57               21 NNE AERO 18 NE* RMY 20 6/8  76/52/64/0/0.00/602/66                21 SSE AERO 21 SSE RMY 18 6/9  78/53/66/+2/0.16/438/48               48 N   AERO 54 N   RMY 52 TSTM 6/10 83/59/71/+6/0.00/722/79               25 SSW AERO 28 SSW RMY 27   6/11 89/64/77/+12/0.00/704/77              29 SW  AERO 32 WSW RMY 30 6/12 94/69/82/+17/0.00/851/93              28 W   AERO 29 W   RMY 28 6/13 92/67/80/+15/0.03/.../..              25 W   AERO 28 WNW RMY 28 6/14 78/56/67/+1/0.02/.../..               20 S   AERO 20 S   RMY 20 6/15 75/54/65/-1/0.00/.../..               25 SSW AERO 29 S   RMY 30 6/16 70/56/63/-3/2.14/.../..               28 S   AERO 29 S   RMY N/A 6/17 70/58/64/-3/0.01/000/00               18 S   AERO 18 S   RMY N/A 6/18 82/65/74/+7/T/.../..                  33 SSW*AERO 35 SSW RMY 37 6/19 82/67/75/+8/..../.../..               40 S   AERO 43 S   RMY 43 6/20 Low temp since midnight is 67F; normal low is now 59F DAILY RECORDS FOR JUNE 6/12/17: DAILY RECORD MAXIMUM TEMPERATURE OF 94F,          BREAKS PREVIOUS RECORD OF 92F SET IN 1973 6/12/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 69F,          TIES PREVIOUS RECORD SET IN 1942 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):       RECORDS FOR JUNE 20 HIGH 94F IN 1953 LOW 41F IN 1918 PRECIP 2.62 INS 1945 PEAK GUST 63 MPH NE IN 1967, SSW IN 2010  RECORDS FOR JUNE 21 HIGH 94F IN 2012 LOW 42F IN 1940 PRECIP 1.40 INS 1903 PEAK GUST 51 MPH SSW IN 2000 TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle and Nick Rousseau